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 Post subject: Need help mapping this Collection
PostPosted: Wed Sep 14, 2011 3:24 pm 
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Joined: Mon Apr 25, 2011 5:13 pm
Posts: 5
I had a class with a list of objects that I had defined contained within an IList<Class>. I was implementing a PropertyGrid control to display the objects in this list so that the user can add/edit/remove items from this list.

However, in doing this I had to create a new class that derived from CollectionBase and now I have no idea how to map this type of class via NHibernate.

Can someone guide me in the right direction?

Here is my base class that is included within the list:
Code:
[ComVisible(true)]
    [TypeConverter(typeof(ExpandableObjectConverter))]
    [CategoryAttribute("Configuration")]
    [Serializable]
    public class Zone
    {
        #region Private Fields

        private bool active;
        private string dir;
        private Heading heading = new Heading();
        private int id;
        private int intID;
        private Position start = new Position();
        private Position finish = new Position();
        private int width;
        private Position[] corners = new Position[4];
        private Streets streets = new Streets();

        #endregion

        #region Constructors

        public Zone()
        {
            if (Program.main != null)
            {
                IntID = Program.main.intID;

                Intersection intersection = Program.data.Intersections.list.Find(
                    delegate(Intersection tInt)
                    {
                        return tInt.ID == IntID;
                    }
                );

                if (intersection != null)
                {
                    Streets.Crossing = intersection.Streets.Crossing;
                    Streets.Route = intersection.Streets.Route;
                }
            }
        }

        #endregion

        #region Properties

        public virtual long PK { get; set; }

        [Browsable(false)]
        public virtual bool Active
        {
            get { return active; }
            set { active = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The direction for the Zone.")]
        public virtual string Dir
        {
            get { return dir; }
            set { dir = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The heading for the Zone.")]
        public virtual Heading Heading
        {
            get { return heading; }
            set { heading = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The Zone Identification Number.")]
        public virtual int ID
        {
            get { return id; }
            set { id = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The Identification Number associated with the Priority Detector of the Zone.")]
        public virtual int IntID
        {
            get { return intID; }
            set { intID = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The location of the Zone's Start.")]
        public virtual Position Start
        {
            get { return start; }
            set { start = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The location of the Zone's Finish.")]
        public virtual Position Finish
        {
            get { return finish; }
            set { finish = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The width of the Zone.")]
        public virtual int Width
        {
            get { return width; }
            set { width = value; }
        }

        [Browsable(false)]
        public virtual Position[] Corners
        {
            get { return corners; }
            set { corners = value; }
        }

        [CategoryAttribute("Configuration"),
            DescriptionAttribute("The streets associated with the Zone."),
            DisplayName("Zone Streets")]
        public virtual Streets Streets
        {
            get { return streets; }
            set { streets = value; }
        }

        #endregion
}


Here is the Collection that the list property is now the type of:
Code:
public class ZoneCollection : CollectionBase, ICustomTypeDescriptor
    {
        #region Collection Implementation

        /// <summary>
        /// Adds an zone object to the collection
        /// </summary>
        /// <param name="emp"></param>
        public void Add(Zone zone)
        {
            this.List.Add(zone);
        }

        /// <summary>
        /// Removes an zone object from the collection
        /// </summary>
        /// <param name="emp"></param>
        public void Remove(Zone zone)
        {
            this.List.Remove(zone);
        }

        /// <summary>
        /// Returns an employee object at index position.
        /// </summary>
        public Zone this[int index]
        {
            get
            {
                return (Zone)this.List[index];
            }
        }

        #endregion

        // Implementation of interface ICustomTypeDescriptor
        #region ICustomTypeDescriptor impl

        public String GetClassName()
        {
            return TypeDescriptor.GetClassName(this, true);
        }

        public AttributeCollection GetAttributes()
        {
            return TypeDescriptor.GetAttributes(this, true);
        }

        public String GetComponentName()
        {
            return TypeDescriptor.GetComponentName(this, true);
        }

        public TypeConverter GetConverter()
        {
            return TypeDescriptor.GetConverter(this, true);
        }

        public EventDescriptor GetDefaultEvent()
        {
            return TypeDescriptor.GetDefaultEvent(this, true);
        }

        public PropertyDescriptor GetDefaultProperty()
        {
            return TypeDescriptor.GetDefaultProperty(this, true);
        }

        public object GetEditor(Type editorBaseType)
        {
            return TypeDescriptor.GetEditor(this, editorBaseType, true);
        }

        public EventDescriptorCollection GetEvents(Attribute[] attributes)
        {
            return TypeDescriptor.GetEvents(this, attributes, true);
        }

        public EventDescriptorCollection GetEvents()
        {
            return TypeDescriptor.GetEvents(this, true);
        }

        public object GetPropertyOwner(PropertyDescriptor pd)
        {
            return this;
        }


        /// <summary>
        /// Called to get the properties of this type. Returns properties with certain
        /// attributes. this restriction is not implemented here.
        /// </summary>
        /// <param name="attributes"></param>
        /// <returns></returns>
        public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
        {
            return GetProperties();
        }

        /// <summary>
        /// Called to get the properties of this type.
        /// </summary>
        /// <returns></returns>
        public PropertyDescriptorCollection GetProperties()
        {
            //return ((ICustomTypeDescriptor)this).GetProperties(new Attribute[0]);
            // Create a collection object to hold property descriptors
            PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);

            // Iterate the list of employees
            for (int i = 0; i < this.List.Count; i++)
            {
                // Create a property descriptor for the employee item and add to the property descriptor collection
                ZoneCollectionPropertyDescriptor pd = new ZoneCollectionPropertyDescriptor(this, i);
                pds.Add(pd);
            }
            // return the property descriptor collection
            return pds;
        }

        #endregion
    }

    /// <summary>
    /// Summary description for CollectionPropertyDescriptor.
    /// </summary>
    public class ZoneCollectionPropertyDescriptor : PropertyDescriptor
    {
        private ZoneCollection collection = null;
        private int index = -1;

        public ZoneCollectionPropertyDescriptor(ZoneCollection coll, int idx) :
            base("#" + idx.ToString(), null)
        {
            this.collection = coll;
            this.index = idx;
        }

        public override AttributeCollection Attributes
        {
            get
            {
                return new AttributeCollection(null);
            }
        }

        public override bool CanResetValue(object component)
        {
            return true;
        }

        public override Type ComponentType
        {
            get
            {
                return this.collection.GetType();
            }
        }

        public override string DisplayName
        {
            get
            {
                Zone zone = this.collection[index];
                return zone.ID.ToString();
            }
        }

        public override string Description
        {
            get
            {
                Zone zone = this.collection[index];
                StringBuilder sb = new StringBuilder();
                sb.Append(zone.ID.ToString());

                if ( zone.Streets.Route != String.Empty || zone.Streets.Crossing != String.Empty)
                    sb.Append("::");
                if (zone.Streets.Route != String.Empty)
                    sb.Append(zone.Streets.Route);
                if ( zone.Streets.Crossing != String.Empty)
                {
                    sb.Append(" and ");
                    sb.Append(zone.Streets.Crossing);
                }

                return sb.ToString();
            }
        }

        public override object GetValue(object component)
        {
            return this.collection[index];
        }

        public override bool IsReadOnly
        {
            get { return false; }
        }

        public override string Name
        {
            get { return "#" + index.ToString(); }
        }

        public override Type PropertyType
        {
            get { return this.collection[index].GetType(); }
        }

        public override void ResetValue(object component)
        {
        }

        public override bool ShouldSerializeValue(object component)
        {
            return true;
        }

        public override void SetValue(object component, object value)
        {
            // this.collection[index] = value;
        }
    }


And here is my original mapping for the class that contains the List of Zones:
Code:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class xmlns="urn:nhibernate-mapping-2.2" name="EMTRAC.Devices.Device, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Device`" lazy="false">
    <id name="PK" type="System.Int64, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="PK" />
      <generator class="identity" />
    </id>
    <many-to-one class="EMTRAC.Connections.Connection, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="LocalConnection" lazy="false" cascade="all">
      <column name="LocalConnection_id" />
    </many-to-one>
    <many-to-one class="EMTRAC.Connections.Connection, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Connection" lazy="false" cascade="all">
      <column name="Connection_id" />
    </many-to-one>
    <many-to-one class="EMTRAC.Packets.Packet, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Configuration" lazy="false" cascade="all">
      <column name="Configuration_id" />
    </many-to-one>
    <joined-subclass name="EMTRAC.Intersections.Intersection, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" lazy="false">
      <key>
        <column name="Device_id" />
      </key>
      <bag name="Zones" cascade="all-delete-orphan">
        <key>
          <column name="Intersection_id" />
        </key>
        <one-to-many class="EMTRAC.Zones.Zone, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/>
      </bag>
      <many-to-one class="EMTRAC.Intersections.Streets, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Streets" lazy="false" cascade="all">
        <column name="Streets_id" />
      </many-to-one>
      <many-to-one class="EMTRAC.Positions.Position, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Position" lazy="false" cascade="all">
        <column name="Position" />
      </many-to-one>
    </joined-subclass>
  </class>
</hibernate-mapping>


And finally here is my Zone class mapping:
Code:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class xmlns="urn:nhibernate-mapping-2.2" name="EMTRAC.Zones.Zone, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Zone`" lazy="false">
    <id name="ID" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="PK" />
      <generator class="identity" />
    </id>
    <property name="Active" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Active" />
    </property>
    <property name="Dir" type="System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Dir" />
    </property>
    <property name="IntID" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="IntID" />
    </property>
    <property name="Width" type="System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Width" />
    </property>
    <many-to-one class="EMTRAC.Headings.Heading, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Heading" cascade="all-delete-orphan">
      <column name="Heading_id" />
    </many-to-one>
    <many-to-one class="EMTRAC.Positions.Position, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Start" cascade="all-delete-orphan">
      <column name="Start_id" />
    </many-to-one>
    <many-to-one class="EMTRAC.Positions.Position, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Finish" cascade="all-delete-orphan">
      <column name="Finish_id" />
    </many-to-one>
  </class>
</hibernate-mapping>


Can anyone help me out?


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